Gearing.



G. E. RAYMOND. GEARING. APPLICATION 211.121) 11.4, 1911.

1,033,468. Patented July23, 1912.

*YZ/izfiaa-s'ses. fawemak" the following is .a specification.

CHARLES E. RAYMOND, or ro srom iaassaonusnrrs.

ossamer.

Application filed April 4, 1911. ser a No. 618,799. f

TqaZl-whom it may concern:

3' Be it known that I, CHARLES E. RAYMOND, a citizen of theUnited-States, residing at ;Bo ston,'in the county of Suffolk and Stateof Massachusetts, have invented new and usefullmprovements in Gearing,of which This invention relates to improvements. gearing, and its objectis to eliminate the usual noise due to backlash between the teeth ofint'ermeshing gears.

V In .all kinds of gearing in which there j .any backlash whatsoever,whether inspur gear s,.b'evel gears,- or in sprocket wheels and chainsthe backlash or play between the teeth at the pitch line,however'slight, produces more or less noise which is unpleasant, and thepurpose of this'invention isto provide gears of this class with meansfor preventmgsuc'h no se.

j -The invention consistsin .the novel features of construction and inthe combina-e t'ionand arrangem'entof parts set- .forth in the followingspecification and particularly.

pointed out in the claims.

. 1. Referring to the drawings Figure 1 is an elevation of a pair ofintermes'hlng gears embodying my-invention. Fig. 2 is a sectional viewtaken .on linev 2-2"of'Fig. 1.

Fig. 3 is a detail sectional view taken on line 3-3 of Fig. 1. Fig. 4 isa detall'elevatlon of a portion of the two-part gear showing the twoparts in the position which they occupy when the teeth are; out of meshwith the other gear.

'Like numerals refer to like parts through-- out the several views ofthe drawings.

7 a 7 enerall 49 g In the drawings, the numeral-5 designates arrangeparts6 and 7 rotatably mounted 'with respect to. each other andpreferably a .the part 6 consists of a. ring jo'urnaled upon the part 7..The part 6 is provided -with aset of suitable teeth. 8'and the part 7is provided with an identical set of teeth 9, these teeth, in practice,being cut on both partsat .the same time. by fastening the two partstoeach other in any suitable manner. \Vlnle this 'is the .case with cutgears, it is, of

"course", not the case with gears having cast teeth. -The two parts ofthe gear 5 are connected to each other by elastic yielding means urgingthe teeth of said parts in op-- posite' directions circumferent-lallywith respectto each-other, said means preferably consisting-of one ormore spr ngs 10 of any inent'with the-studs 12, respectively,

the-springs 10,-res pecti"ely, and pref rably,. 'saidscrews 'areprovided with pyrlimidal a gear comprising" two coaxially- .by drillingthemetal .0

Specification st letteil atentl Pat itd 3,

suitable construction carried by one of the instance, thegsprings 10 aresomewhat bowshaped, as w11l be ev dent from anli'nparts andengagedbypne'ormore elements carried by the other. part. .In the presentspection of Figs. 1 and'4, and are located in slot's- 11'pr'ovidedfin'the ring 6, 'said' .slots are concentrically arrangedrelatively.

to the axis of said gear andare counter.- bored a portion of theirlength, said counterbored portionand saidslot terminating in holes 11,which areequal in diameterto said .counterbored portions. Studs 12secured tot-hepart 7 '01? said gears are prov1ded .with heads13..substantially equal .in

diameter to the holes 1l, .into which they are placed, and the ring 6rotated until said heads 13 engage the shoulders. 14 of said slots whichare formedjby-said*count rbore {and which look said gearsagainst ateralmovement relatively to each other; Forfthe'" I sake ofeconomiz'ing;space, the studs 12'ma beprovided withfiat faces-1,5.- V

Screws 16 having screw-threaded engage: gage ends 17 located incorresponding pyramidal spectively, thus providing-a means the screwsare ,heldagainst acciden "al turn ing due to vibration and other ca isesand yet may be rotated to vary the tension of the depressions'18providedin the springs 10, re-

springs 10 simply by .applying sufiicient force to the screws to freethe corners of the y as vhereby pyramidal ends of the screws from the.cor- 4 responding corners of the pyramidal de-- pressions in whichthey'are normally located. For the purpose of a justing thescrews 16,the same maybeprovided with squared portions' 19 to whichasui't-ablewrench may be applied. Preferably the springs 10 are seatedin extremities of each. of the the ring- 6' part' way through from theinner toward the ockets 20 formed outer face, but-'terminating short ofthe outer face, as will be evident from an-in- "spection of Fig. 3.These pockets provide room for the springs -to flatten when sufii--cient force is applied thereto and also re- .vent the'springs fromcoming out of p ace accidentally, it being evident that the ring 6 niustbe removed in order to permit the removal of the springs. "The screws 16also form an additional means for preventing placed;

The gearmay meshjwith any suitable :element to drive or bedriv'en, such,for ex? ample, as. a rack or gear, the latter being shown in thedrawingshnd designated by the numeral 21. It will be understood,however, that by properlyshaping the teeth of the gear 5 the samemaylie-adapted to mesh with a chainand my invention isnot limited to theprecise construction shown, In male! ing up'the gear 5, the two parts 6and 7 will, in practice,be pinned together by a'pin'22, shown indot-tedlines in Fig. 2, driven through a hole 23 provided in thepart/6and a holefl t provided in'thepart 7, this pin serving to cause theteeth 8, and 9 'to register witlreach other u'ntil the teeth of thegear- 21 havebeen placed in mesh therewrth, after which the 'pin 22 maybe drive out; It'will now be evident that the-springs lO'urge theteetlrS and 9 of'the parts 6 and .7, respectively, against oppositefian'ksofthe teeth of the gear 21 andaecordiiigly, the spaces betweenthe .teeth of the gear 2-1 at the pitch line' will be. entirely filledby the.

be no backlash \'l iateve1;. The tendency of thespringis 10*:to rotate.the two' parts (5 and '7 in opposite directions with respect to eachother is illustrated in Fig. which shows the relative positions occupiedby the teeth when the gear 21 is Ynthdratvn from mesh therewith.

\Vhile gears constructed as herein shown 'ard described may be utilizedtor a variety-of purposes, thevare particularlyin-' tended and} adaptedto-be used .in places where no' se is undesirable, and wherespaceevident that such noise maybe obviated'by the use' of gearingconstructed in accord anoe with my invention.

Having thus described myinv'ention, what I claim and 'dsirebyLetterslatentto secure is:

r 1. A'toothed'gear having, i n combination,

.tw-o. coaxially arrangedparts each having at set. of teeth around itsperiphery, a stud se cured in one of said parts and provided with ahead,the other of said parts having a slot therein concentrically arrangedrelatively to the axis of-said par-t, one endotsaid slot {terminating ina hole substantially. equal in diameter to the head of said stud and theother 9nd of said-slot having a shoulder adapteh to engageihe under sideofsaid head whereby said g'ear parts may be placed together and lockedagainst lateral movement relatively to-eaclrother, a flat spring locatedin said slot and provided with a depression, and a screw havingsewn-threaded engagement with said stud and havingone end locatediii-said depression. -2. A toothed gear having, in combination, twocoaxially'arranged parts each having a set of teeth around itsperiphery,one of said parts, consisting of 'aring 'journaled 'upon the other ofsaid parts, and having a 'slot th erein concentrically arran 'edrelatively to the axis ofsaidgear, a'stud secured in the other .of saidparts proyidednvithia head and ad aptedto engage said slot, afiat-spring, located in said slot and provided with a,py-' ramidalIdepression, and a screw having screw-threaded engagementavit-h said studalulprovided with a pyramidal shapedlend adapted to engage thecorresponding depression in said spring.- Tn-testimony whereof I 'havehereunto set my hand in presence of twois'ubscribing wit nesses.

CHARLES IE, RA'YhK )Nl);

Witnesses Louis A. Jones, Amm I-l. Eiunmf.

